/**
 *    Copyright (C) 2025-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the Server Side Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */
#pragma once

#include "mongo/db/extension/host/document_source_extension.h"
#include "mongo/db/extension/shared/handle/aggregation_stage/parse_node.h"
#include "mongo/db/extension/shared/handle/aggregation_stage/stage_descriptor.h"
#include "mongo/util/modules.h"

namespace mongo::extension::host {

class DocumentSourceExtensionExpandable : public DocumentSourceExtension {
public:
    static boost::intrusive_ptr<DocumentSourceExtensionExpandable> create(
        const boost::intrusive_ptr<ExpressionContext>& expCtx,
        BSONObj rawStage,
        AggStageDescriptorHandle staticDescriptor) {
        return boost::intrusive_ptr<DocumentSourceExtensionExpandable>(
            new DocumentSourceExtensionExpandable(expCtx, rawStage, staticDescriptor));
    }

    Value serialize(const SerializationOptions& opts) const override;

    std::list<boost::intrusive_ptr<DocumentSource>> expand() const {
        return expandParseNode(getExpCtx(), _parseNode);
    }

    // Recursive helper for expand().
    static std::list<boost::intrusive_ptr<DocumentSource>> expandParseNode(
        const boost::intrusive_ptr<ExpressionContext>& expCtx,
        const AggStageParseNodeHandle& parseNodeHandle);

    static const Id& id;

    Id getId() const override;

    boost::optional<DistributedPlanLogic> distributedPlanLogic() override {
        tasserted(11420600,
                  "distributedPlanLogic() should not be called on "
                  "DocumentSourceExtensionExpandable. Expandable stages should have been desugared "
                  "to Optimizable stages before calling distributedPlanLogic()");
    }

    // Define how to desugar a DocumentSourceExtensionExpandable.
    static Desugarer::StageExpander stageExpander;

private:
    const AggStageParseNodeHandle _parseNode;

    DocumentSourceExtensionExpandable(const boost::intrusive_ptr<ExpressionContext>& expCtx,
                                      BSONObj rawStage,
                                      extension::AggStageDescriptorHandle staticDescriptor)
        : DocumentSourceExtension(staticDescriptor.getName(), expCtx),
          _parseNode(staticDescriptor.parse(rawStage)) {}
};

}  // namespace mongo::extension::host
